chambers



I. A. CHAMBERS.

NIANUFACTURE OF GLASS.

APPucATxoN m50 oc1.8.19xa

Paered July 8, 1919.

- 2 SHLETS-SHEET 2.

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UNTED STA OFFICE.

.minus A. CHAMBERS, or rirrsnn rnnrisrtvanre.

miinnrnc'rnnn or Grises.

reference being had to the accompanying' drawings, forming part of this specification, in which- Figure l is a vertical, sectional view of the drawing-tank of a glass-tank furnace, showing the parts in position for drawing a. cylinder of glass; F ig. 2 lis a like view showing the parts in position for cutting on the cylinder after it has ybeen drawn; Fig. 3 is a like view showing the parts in position for pouring molten glass into the drawing ring after the cylinder has been ont ci and removed; Fig.- is a plan view or' the drawing-tank; and Fig. 5 is a front elevation of the brick Work of' the same.

ln the drawing of glass cylinders from a tank in the manufacture of window glass, it is usual to draw the glass through a draw` ing-ring which rests on 'the surr'ace evii the molten glass in the tank and through cover-slab, having a central aperture, which during the drawing operation rests on the drawing ring; and7 when the cylinder has been drawn to the desired length, it is separated from. the glass in the tank by projecting flame against the lower portion oi the cylinder, the cover-slab being raised suiioien-tly from the drawing ring to i'orin an inclosed space about the cylinder, through which space the flame is caused to pass. The cylinder is then removed, and the stump or remnant of hardened glass, which constituted Ithe lower portion of the cylinder, is left at the surface of the molten glass in the tank and must be re-melted before second cylinder can be drawn through the drawing-ring, which re-melting is an plished by placing a cover on the in the cover-slab and continuing the flame over the surface of the glass in the drawing tank. The disadvantages incident to thi method arevv the loss of time required in this ria-melting operation, and the heating oir the molten glass in the drawing-tank to tern-- perature greater than that at which the best result in drawing the cylinder can be obtained. Y

The object of my invention is to re-rnelt Specieatien of Letters Estant.

Patented July 8, glia Application filed etober 8, ISES. Serial No. 257,@5.

hardened glass, left in the drawing-tank after the cylinder has 'been removed,-rapidly and without unduly affecting the temperature ci' the molten Glass in the drawing tenir; and it consists in melting the hardened glass by bringing molten glass 01' a greater terra perature in contact therewith, preferably by i pouring molten glass, of a higher temperature than the glass in the drawing' portion of the tank, through the dra.wing-ring, which as it melts the hardened glass is itself thereby reduced in temperature.

l will now so describe my invention that others skilled in the art may employ the saine.

in the drawings l show a portion or" a tank-iurnace such as is in use in the manufacture oi glass-cylinders, although i do not desire to limit rn? invention thereto, in which drawings, 2, represents the drawing-tank which communicates with the tarL-iurnace.

, rihis drawing-tenir is rovided with a to 3 having removable sections or sla s i in which are circular apertures, at 5, over which may be iitted removable covers 6. These slabs ei and covers 5 ina Y be raised by means of chains indicated by dotted lines at 7, and 8. inside or the drawingtank below the slabs ai, and at the surface ci" the molten glass in.

the tabla are the .drawing rings 9 through which the glass cylinders may be drawn in the usual manner. in the front wall or the drawingntank are apertures through which gas pipes l0 extend to discharge gas into the tank on a horizontal plane directly above the drawing ring toward a iiue l, which oiens from the drawing-tank into the tank- ;turnace, Above the gas piges il are removabie 'blocks l2 which may be raised vertically by means or chains indicated in Fig.

of the drawings by a dotted line at 13.

the drawing or' the glass-cylinders, the parts in the positions in Fig. l the cylinder is 4drawn in the usual inanner. 1When cylinder has been formed, the cover-slab a is raised to the position shewn in 2, and gas is caused to enter the space between the slab and the drawing 9, which causes be projected again 't lower portion of the l s, wine'` ith an accelerated ineving of the drawing or the cylinder, separates it iron-1 the molten glass in the tank, and the cylinder is withdrawn, while the stump of hardened glass remains au the surface or ico the molten glass in the drawing ring in the tank.

At this point in the operation, instead on,

' to the positionsshown in F ig. 3, and introduce molten glassinto the tank furnace on top of the hardenedY glass, and preferably through the drawing-ung 9, by means of a ladle 15, the glass so introduced being of a greater temperature than the glass in the drawing-tank, that is if the glass in the drawing tank after the cylinder has been drawn is at a temperature of from eighteen hundred to twenty hundred degrees F., the molten glass introduced should be of about twenty to twenty-three hundred degrees, which serves to re-melt the hardened stump of glass, and, also displaces the remnant by displacing the molten glass resulting from the melting thereof, forcing it out or' the drawing-ring; and as the glass which is poured into the ring is thereby reduced in temperature the molten glass in thev ring in the tank is brought to the proper temperature for drawing another cylinder from the tank through the same drawing ring Without the excessive loss of time incident to the melting of the hardened glass by flame vand the subsequent cooling of the glass in the tank to the temperature required in the drawing of the glass Although I have shown a tank-furnace having a cover-slab of the usual thickness necessary to the retention of the heat during` the re-melting operation, it will be found that a much thinner slab may he n. l, J

in my process, which would enable cylinder as it is formed to more rectly into the coolness o the atmosphere, thus hardening the glass o the cylinder at a point closer to the molten glass, enabling the cylinder to be drawn more rapidly. I do not desire, however, to limit my process to the type of' furnace shown, nor do I desire to limit it to the introduction of the molten glass by means of a ladle, or to the exact temperaturesv I have stated, as these are matters which may be varied by those skilled in the art.

What I claim and desire to secure by Letters Patent is:

l. In the manufacture of glass, drawing an article from a mass of molten glass suiiicient to produce a plurality oi articles, separating the article from the mass of molten glass, and melting the remnant of the article in the mass oi' molten glass by the addi-r set my hand.

JAMES A. CHAMBERS. Witnesses:

. JAMES K. BAKEWELL,

SUE B. FRITZ.

Gepies of this patent .may be obtained for vecen'ts each, byifdressing the Commissioner of Patents.

Washingten, D. G. 

